isort doesn't format the imports in PyCharm's Jupyter notebooks

Hi! I've just created an External Tool instance for isort in PyCharm Professional and checked whether it works or not. Here's a screenshot of my tool's settings.

It turned out that it works smoothly with regular .py scripts, but it doesn't work with .ipynb files (Jupyter notebooks) at all. It might be worth noting that I've also been using the black formatter (see the settings in the screenshot below) together with isort and it works without any problems in .py files.

However, when I run isort in a notebook, it doesn't format imports in the notebook's cells; I just receive the following output:

C:\Users\USERNAME\AppData\Local\Programs\Python\Python310/Scripts/isort file_name.ipynb

Process finished with exit code 0

The only solution I've come across at this point is to use nbQA in the terminal as follows:
nbqa isort file_name.ipynb

In this case, it's possible to format the imports as expected. Could you tell me if it's a bug or not? Would it be better to contact JetBrains, as it might be a problem from their side?

Start by reproducing the reported difference between running isort directly on a .ipynb file and running nbqa isort on the same notebook. Check whether notebook-cell formatting is expected from isort itself or depends on PyCharm or nbQA; done means the supported behavior and ownership are clear, with a regression test or documentation path identified.